CONTENTS 



Art. XXIV. — Further Studies of the Drainage Features of 

 the Upper Ohio Basin ; by T. C. Chamberxin and F. 

 Leveeett 247 



XXV. — An apparatus to show, simultaneously to several 

 hearers, the blending of the sensations of* interrupted 

 tones; by A. M. Mayes _ 283 



XXVI. — Post-Eocene Formations of the Coastal Plain of 



Alabama; by E. A. Smith ... 285 



XXVII.— Variscite from Utah ; by R. L. Packard 297 



XXVIIP — Appendages of the Pygidium of Triarthrus; by 



C. E. Beeches. (With Plate VII) 298 



XXIX. — Geological Position of the Eocene Deposits of 



Maryland and Virginia ; by G. D. Haeeis - 301 



XXX. — Contributions to the Crystallization of Willemite ; 



by S. L. Penfield 305 



XXXI. — Occurrence of Olenellus in the Green Pond Moun- 

 tain Series of Northern New Jersey, with a Note on the 

 Conglomerates; by C. D. Watcott 309 



XXXII. — Notes on Nickeliferous Pyrite from Murray Mine, 



Sudbury, Out.; by T. L. Waekee 312 



SCIENTIFIC INTELLIGENCE. 



Chemistry and Physics — Electric Conductivity of Flames, de Hemptinxe, 314. — 

 Electrolysis of Steam. J. J. Thomson : Temperature of Ignition of Gaseous Ex- 

 plosive Mixtures, V. Meter and Munch, 315. — Composition of Water by Vol- 

 ume, Scott, 3 1 6. — Production of Hyponitrous acid, Tiiusi, 3 1 7 . — Potassium and 

 Sodium Carbonyls, Joaxnis, 318. 



Geology and Mineralogy — International Congress of Geologists, 318. — Geological 

 Survey of the State of New York, Palaeontology, J. Hall and J. M. Clarke : 

 Alabama Geological Survey, A. M. Gibson : Geological Survey of Texas, 1892, 

 E. T. Dujlble, 319. — Outline of the Geology and Physical Features of Maryland, 

 G. H. Williams and W: B. Clark : Lehrbuch der Petrographie, Dr. F. Zirkel : 

 Geological Survey of Portugal, P. Choffat: Untersuchungen uber Fossile 

 Holzer Schwedens, H. Coxwextz, 320.— Swedish lower Paleozoic Hyolithesand 

 Conularice, G. Holji, 321. 



Miscellaneous Scientific Intelligence — British Association for the Advancement 

 of Science: History of Mathematics, F. Cajori: Ejected Blocks of Monte 

 Somma, H.J. Johxstox-Davis. 321. 



